0000021: Adding .wbfs files and then transferred to drive destroys the wbfs

Description

I compress Wii-ISO-files to wbfs because they are usually getting smaller than RAR-files. I use "wit copy *.iso -d . --wbfs"

But adding wbfs files created from this seem to fail at Wii Backup Manager. When transferred to the USB drive, the WII fails to boot the game. However if I copy the wbfs file directly to the USB-drive, the WII game will run.